diff --git a/system/Commands/Utilities/Routes/AutoRouterImproved/AutoRouteCollector.php b/system/Commands/Utilities/Routes/AutoRouterImproved/AutoRouteCollector.php
index 579969346637..4c705fd439b1 100644
--- a/system/Commands/Utilities/Routes/AutoRouterImproved/AutoRouteCollector.php
+++ b/system/Commands/Utilities/Routes/AutoRouterImproved/AutoRouteCollector.php
@@ -36,7 +36,7 @@ public function __construct(
         private readonly string $defaultMethod,
         private readonly array $httpMethods,
         private readonly array $protectedControllers,
-        private string $prefix = ''
+        private readonly string $prefix = ''
     ) {
     }
 
diff --git a/system/HTTP/SiteURI.php b/system/HTTP/SiteURI.php
index def61b65e17b..ab0cdd19c955 100644
--- a/system/HTTP/SiteURI.php
+++ b/system/HTTP/SiteURI.php
@@ -41,7 +41,7 @@ class SiteURI extends URI
     /**
      * The Index File.
      */
-    private string $indexPage;
+    private readonly string $indexPage;
 
     /**
      * List of URI segments in baseURL and indexPage.